US4480278A - Recording and reproducing apparatus for video signals - Google Patents

Recording and reproducing apparatus for video signals Download PDF

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Publication number
US4480278A
US4480278A US06/347,196 US34719682A US4480278A US 4480278 A US4480278 A US 4480278A US 34719682 A US34719682 A US 34719682A US 4480278 A US4480278 A US 4480278A
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United States
Prior art keywords
electrical power
power source
speed
recording
reproducing
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Expired - Lifetime
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US06/347,196
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English (en)
Inventor
Masaya Maeda
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Canon Inc
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Canon Inc
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Assigned to CANON KABUSHIKI KAISHA NO. reassignment CANON KABUSHIKI KAISHA NO. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MAEDA, MASAYA
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/44—Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor
    • G11B15/442—Control thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B31/00—Arrangements for the associated working of recording or reproducing apparatus with related apparatus
    • G11B31/006—Arrangements for the associated working of recording or reproducing apparatus with related apparatus with video camera or receiver
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass

Definitions

  • This invention relates to video signal recording and reproducing apparatus capable of permitting recordings out of doors and capable of variable speed reproduction.
  • the present invention may be embodied in the following example of a conventional magnetic recording and reproducing apparatus using magnetic tape as the recording medium (hereinafter referred to as "VTR").
  • the conventional VTR operates in such a manner that a magnetic tape is brought into contact against a cylindrical tape guide including a magnetic head over a predetermined angular distance, and, while video signals are being recorded on said tape for every one field or two fields in one of the successively formed inclined tracks, the tape is transported at a constant speed when the aforesaid video signals are being recorded or reproduced.
  • the tape When reproducing the thus-recorded video signals on the magnetic tape, the tape may be transported at a different speed from that at which the recording was made, thereby slow motion, high speed reproduction and other speed-changed reproductions are made possible.
  • the aforesaid high speed reproduction is advantageous for skipping an identified portion of the recorded tape, or searching.
  • the former method owing to the fact that the running speeds of the tape when in the fast feed and fast rewind modes are generally considerably higher than when in the recording mode, is relatively easy to realize for high speed reproduction.
  • it has a disadvantage in that as the diameter of the wound tape changes, the running speed of the tape changes correspondingly.
  • the present invention has been made to eliminate the above-described drawbacks and, if embodied in a VTR, will provide a type of VTR in which, when in a reproducing mode, the tape speed is selectively controlled by obtaining at least two voltages.
  • the capstan motor is arranged to operate, when in the reproducing mode, with either the same voltage as in the recording mode, with the tape transport moving at the same speed as in recording, or with a higher voltage than the aforesaid voltage to move the tape transport at a higher speed.
  • FIG. 1 is a side elevational view of an embodiment of a VTR according to the present invention, connected to a video camera.
  • FIG. 2 illustrates the details of internal construction of the VTR.
  • FIG. 3 illustrates the VTR in a reproducing position where an AC adapter and a television set are employed.
  • FIG. 4 is an electrical circuit diagram, partly in block form, of an embodiment of the VTR according to the present invention.
  • FIG. 5 illustrates another embodiment of the VTR according to the present invention.
  • FIG. 1 there is shown a VTR according to an embodiment of the invention as connected with a video camera.
  • the drawing shows the video camera 1, the VTR 2, and video battery 3 used as an electrical power source for the video camera and VTR.
  • a cable 4 transmits video signals and electrical energy between the video camera 1 and the VTR 2 when recording is carried out.
  • FIG. 2 illustrates the internal construction of the VTR 2 where a magnetic tape T pulled out of a cassette 5 passes through a full width eraser head 6, a cylindrical tape guide 7 including a rotary magnetic head, and a control and sound recording and reproducing head 8 to be held across a pinch roller 9 and a capstan 10, and therefrom advanced to a takeup reel 11 within the cassette 5.
  • a supply reel 16 is contained in the same cassette 5.
  • the capstan 10 has a fly wheel 12 concentrically fixed thereto, said fly wheel 12 being rotatably connected to a pulley 14 fixed to a shaft of the capstan motor 13 by an endless belt 15.
  • FIG. 3 there is shown the VTR 2 of the invention as connected to an AC adapter 26 in a reproducing position, where a television set 17 is connected to an RF converter output terminal of the VTR 2.
  • FIG. 4 is a block diagram illustrating an embodiment of the VTR according to the present invention.
  • a DC source circuit 22 comprises a rectifier circuit receptive of a home alternating current source for producing DC current, and a constant voltage circuit for driving the VTR.
  • Power terminals 23 and 24 are on the AC adapter 26 with the terminal 24 supplying a voltage almost equal to the voltage of the battery 3, and the terminal 23 supplying a higher voltage than that appearing at the terminal 24.
  • a power source changeover switch 21 also shows a power source changeover switch 21; a constant voltage circuit 19; a capstan motor control circuit 18 for sensing and controlling the number of revolutions of the capstan motor 13; a capstan motor drive circuit 25 for driving the capstan motor 13; a mode changeover switch 20 having positions at which the motor 13 rotates at normal and high speeds for the normal reproduction modes and the high speed reproduction or high speed search mode, respectively.
  • the camera 1 and the VTR 2 are coupled with each other whereby the battery 3 serves as the power source for the capstan motor 13 of FIG. 2.
  • This VTR 2 may be otherwise of a unified form incorporating the camera 1 therein, and the battery 3 may be otherwise located in the VTR 2.
  • the electrical power supplied from the battery 3 is applied through the switch 21 in its "a" position to the constant voltage circuit 19 and therefrom through an electrical power supply line A to a signal processing circuit (not shown) and the capstan motor control circuit 18, and further therefrom through the changeover switch 20 in its "a” position to the capstan motor drive circuit 25.
  • the capstan motor control circuit 18 operates in such a manner that the speed of rotation of the capstan motor 13 is adjusted to a predetermined level as sensed.
  • the capstan motor control circuit 18 forms a closed loop together with the capstan motor drive circuit 25 and the capstan motor 13 so that fine adjustment of the aforesaid speed of rotation is controlled.
  • a unit including the DC source for example, an AC adapter, tuner or the like is coupled to the VTR, and the switch 21 is moved to its "b" position where the DC electrical power source circuit 22 serves as the electrical power source for the VTR.
  • the DC electrical power source circuit 22 can be used as the electrical power source.
  • the electrical power source changeover switch 21 When in the normal reproduction, the electrical power source changeover switch 21 is moved to its "b" position and the mode changeover switch 20 is left unchanged from “a” position, thus energizing the motor 13.
  • the control signals recorded in the vicinity of the edge of the tape T are being reproduced by the control head 8
  • the video signal tracks which are slant recorded on the magnetic tape T in sequence are traced to be reproduced by the rotary head incorporated in the cylindrical tape guide 7.
  • the capstan motor 13 is driven by the same voltage as in the normal recording, and its speed is controlled in the above-described manner.
  • setting of the high speed search mode causes the switch 20 to be moved to "b" position where the high voltage for the high speed search is supplied from the terminal 23 of the AC adapter 26 so that the capstan 10 rotates at the higher speed than when in the normal reproduction mode, thus permitting high speed reproduction.
  • FIG. 5 illustrates another embodiment of the VTR according to the present invention where the same reference characters have been employed to denote similar parts to those shown in FIG. 4.
  • a relay 27 is responsive to flow of current for setting a switch 21' in "b" position, and responsive to no flow of current will set the switch 21' in "a" position.
  • the relay 27 upon connection of an AC adapter 26 or other suitable external electrical power source, the relay 27 is supplied with current, thereby the switch 21' is automatically changed over to "b" position to render the VTR cooperative with the external electrical power source.
  • the range of selectively controllable tape speeds when in the reproduction mode can be extended remarkably by the use of means of very simple construction, and further the use of an external electrical power source makes it possible to increase the tape speed for the high speed reproduction by the capstan drive.
  • an external electrical power source makes it possible to increase the tape speed for the high speed reproduction by the capstan drive.
  • premature consumption of electrical energy of the battery can be prevented. Since this can be achieved by providing a changeover switch of simple structure, it does not involve an increase of the circuit volume in the VTR.
  • the present invention has a great advantage at the portable VTR.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Television Signal Processing For Recording (AREA)
  • Management Or Editing Of Information On Record Carriers (AREA)
US06/347,196 1981-02-17 1982-02-09 Recording and reproducing apparatus for video signals Expired - Lifetime US4480278A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP56-21858 1981-02-17
JP56021858A JPS57135454A (en) 1981-02-17 1981-02-17 Magnetic picture recording and reproducing device

Publications (1)

Publication Number Publication Date
US4480278A true US4480278A (en) 1984-10-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/347,196 Expired - Lifetime US4480278A (en) 1981-02-17 1982-02-09 Recording and reproducing apparatus for video signals

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US (1) US4480278A (nl)
JP (1) JPS57135454A (nl)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5016124A (en) * 1986-01-14 1991-05-14 Canon Kabushiki Kaisha Recording apparatus with control of energy to the drive at start up
EP0649251A1 (en) * 1993-10-15 1995-04-19 Matsushita Electric Industrial Co., Ltd. Video camera with record shutoff mechanism
US5446905A (en) * 1989-10-18 1995-08-29 Ricoh Company, Ltd. Data processing apparatus having improved power supply system
US5523857A (en) * 1992-09-22 1996-06-04 Canon Kabushiki Kaisha Image signal recording control in accordance with the detected state or type of power supply
US6222985B1 (en) * 1997-01-27 2001-04-24 Fuji Photo Film Co., Ltd. Camera which records positional data of GPS unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873846A (en) * 1972-09-07 1975-03-25 Sony Corp Power supply system
US3878326A (en) * 1974-02-27 1975-04-15 Rca Corp Voltage supply system
US3974522A (en) * 1973-07-26 1976-08-10 Akai Electric Company Limited Electronic editing method and apparatus for a video tape recorder
US4386376A (en) * 1980-01-15 1983-05-31 Canon Kabushiki Kaisha Video camera
US4400743A (en) * 1980-01-16 1983-08-23 Canon Kabushiki Kaisha Video camera and recorder

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4886808U (nl) * 1972-01-20 1973-10-20

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873846A (en) * 1972-09-07 1975-03-25 Sony Corp Power supply system
US3974522A (en) * 1973-07-26 1976-08-10 Akai Electric Company Limited Electronic editing method and apparatus for a video tape recorder
US3878326A (en) * 1974-02-27 1975-04-15 Rca Corp Voltage supply system
US4386376A (en) * 1980-01-15 1983-05-31 Canon Kabushiki Kaisha Video camera
US4400743A (en) * 1980-01-16 1983-08-23 Canon Kabushiki Kaisha Video camera and recorder

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5016124A (en) * 1986-01-14 1991-05-14 Canon Kabushiki Kaisha Recording apparatus with control of energy to the drive at start up
US5446905A (en) * 1989-10-18 1995-08-29 Ricoh Company, Ltd. Data processing apparatus having improved power supply system
US5523857A (en) * 1992-09-22 1996-06-04 Canon Kabushiki Kaisha Image signal recording control in accordance with the detected state or type of power supply
EP0649251A1 (en) * 1993-10-15 1995-04-19 Matsushita Electric Industrial Co., Ltd. Video camera with record shutoff mechanism
US5521638A (en) * 1993-10-15 1996-05-28 Matsushita Electric Industrial Co., Ltd. Video camera with record shutoff mechanism
US6222985B1 (en) * 1997-01-27 2001-04-24 Fuji Photo Film Co., Ltd. Camera which records positional data of GPS unit
US20010010549A1 (en) * 1997-01-27 2001-08-02 Fuji Photo Film Co., Ltd. Camera which records positional data of GPS unit
US7103267B2 (en) 1997-01-27 2006-09-05 Fuji Photo Film Co., Ltd. Camera which records positional data of GPS unit

Also Published As

Publication number Publication date
JPH0357546B2 (nl) 1991-09-02
JPS57135454A (en) 1982-08-21

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